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Re: FC from 9 to 1.5 in 24 hours?

So as of last night my FC was 8 & CC was 1 so I guess my TC would be 9?

Again based on pool math, with my FC at 1 & goal of 7 with a 600 gallon tank, using 12.5% bleach I should have needed 3.7 oz but used 7.5 (and ended up at 8 FC).

Based on 7.5oz of 12.5% pool math says my FC should be at 13.

I am a bit confused or something else may be off?

I am using this as my guide:

Chlorine Drop test - If you need to......1) measure Chlorine levels accurately or 2) higher than 5ppm or 3) test for Combined Chloramines…perform the Chlorine Drop Test. (FAS/DPD)
1. Rinse and fill the “Chlorine only” graduated cylinder to the 10mL mark
2. Add ONE heaping scoop of the R-870 powder and swirl to mix. (It may not all dissolve….don’t worry) The solution will turn pink. (unless you have no chlorine)
3. Next, carefully add R-871 solution one drop at a time. Count each drop and swirl until the solution turns back to clear. Multiply the number of drops you added times .5 (14 drops X .5 = 7ppm)
4. Record your results as FC (free chlorine)
5. To test for Combined Chloramines, add 5 drops of R-0003 to the solution and swirl. If it remains clear, you have no CC’s. If it returns back to pink, add R-0871 as before, counting and swirling between each drop. Once the solution returns clear, multiply the added drops times .5 again…..this will be your CC reading. Record it. The total of FC and CC should be recorded as TC (total chlorine)

Re: FC from 9 to 1.5 in 24 hours?

So as of last night my FC was 8 & CC was 1 so I guess my TC would be 9?

Again based on pool math, with my FC at 1 & goal of 7 with a 600 gallon tank, using 12.5% bleach I should have needed 3.7 oz but used 7.5 (and ended up at 8 FC).

Based on 7.5oz of 12.5% pool math says my FC should be at 13.

I am a bit confused or something else may be off?

I am using this as my guide:

Chlorine Drop test - If you need to......1) measure Chlorine levels accurately or 2) higher than 5ppm or 3) test for Combined Chloramines…perform the Chlorine Drop Test. (FAS/DPD)
1. Rinse and fill the “Chlorine only” graduated cylinder to the 10mL mark
2. Add ONE heaping scoop of the R-870 powder and swirl to mix. (It may not all dissolve….don’t worry) The solution will turn pink. (unless you have no chlorine)
3. Next, carefully add R-871 solution one drop at a time. Count each drop and swirl until the solution turns back to clear. Multiply the number of drops you added times .5 (14 drops X .5 = 7ppm)
4. Record your results as FC (free chlorine)
5. To test for Combined Chloramines, add 5 drops of R-0003 to the solution and swirl. If it remains clear, you have no CC’s. If it returns back to pink, add R-0871 as before, counting and swirling between each drop. Once the solution returns clear, multiply the added drops times .5 again…..this will be your CC reading. Record it. The total of FC and CC should be recorded as TC (total chlorine)